The flat surface of an object.
A straight line that is perpendicular or that forms a right angle to any line on the plane.
Images formed on a plane when the projected line from an object is perpendicular to the plane.
The diagram above shows the projection of an object on a vertical plane.
The resulting projection is an orthogonal projection because the line projected from an object to the plane is normal.
The following diagram shows a cylindrical object on a horizontal plane.
Given that the diameter of the cylinder is \(4 \text{ cm}\) and its height is \(6 \text{ cm}\).
a) Draw the orthogonal projection of the cylindrical object on a horizontal plane as viewed from \(Z\).
b) Draw the orthogonal projection of the cylindrical object on a vertical plane as viewed from \(Y\).
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